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Depends what subs you want to put in it. The sub should have some info about the recommended cubic capacity the box needs to be. Whether it should be ported, sealed etc.
^ as above, ive only every had 1 prebuilt box, it wasnt totally sealed, used silicon to seal edges (if you use silicon leave box to air for 24hours, as the chemicals in the silicon eat away at the voice coils of the sub!) so now i use p40 (used it in a box edges first time today!).